Few R&B singers can make such a hip-hop splash with their debut mixtape, but singer JR Castro came with plenty of celebrity co-signs when he debuted in 2015. Based out of Las Vegas, the Miguel-like vocalist was discovered by Timbaland. The veteran rap producer enlisted names like Future, Wale, and Mike WiLL Made It for Castro's debut mixtape, which was previewed in 2015 by the Faith Evans-sampling single "Get Home." An instant hit, "Get Home" was produced by DJ Mustard and featured Kid Ink plus Migos member Quavo. ~ David Jeffries